Ratchet-drill.



No. 869,087. PATENTED 001. 22.1907. J. J.. HOURIGAN.

RATGHET DRILL.

APPLICATION FILED AUG. 28, 1905. 4 v

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PATENTED OCT. 22. 1907.

J. J. HOURIGAN.

RATGHBT DRILL. APyLwA'nou FILED AUG.28, 1905.

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PATENTED OCT. 22. 1907.

- J. J, HOURIGAN.

RATCHET DRILL.

APPLICATION FILED AUG. 28, 1905.

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' entree STATES PATENT OFFICE.

JOHN JOSEPH HOURIGAN, OF BRIGHTON-LE-SANDS, NEAR SYDNEY, NEW SOUTH WALES, AUSTRALIA, ASSIGNOR TO JOHN RAVAN, OF SYDNEY, NEW SOUTH WALES, AUSTRALIA.

RATCHET-DR-ILL.

Specification of Letters Patent.

Patented Oct. 22, 1907.

Application filed August 28. 1905. Serial No. 276,085.

To all whom it may concern:

Be it known that I, JOHN Josnrn HOURIGAN, a subject of the King of Great Britain, residing at Princes street, Brighton-le-Sands, near Sydney, in the State of New South Wales, Commonwealth of Australia, have invented certain new and useful Improvements in Ratchet-Drills, of which the following is a specification.

This invention has reference to ratchet drills or braces in which the reciprocating motion of a hand lever is converted into a continuous rotary motion of the drill, the object of the invention being to insure uniformity of the continuous rotary motion with a minimum of friction. Means for quickly reversing the direction of the rotary motion are provided and also for imparting when desired an intermittent instead of a continuous motion. But in order that the invention may be clearly comprehended I will now refer to the drawings accompanying this specification in which,

Figure 1 is an elevation of a ratchet drill or brace constructed in accordance with this invention, while, Fig. 2 is acentral sectional elevation, and, Fig. 3 a plan of same. Fig. 4 is a plan illustrating the arrangement of the intermediate bevel pinions while Fig. 5 is a detail showing a ratchet and bevel wheel. Figs. 4 and 5 are on an enlarged scale. Fig. 6 is a vertical sectional view of the sleeve 24; Fig. 7 is a detail elevation of the sleeve 26; Fig. 8 is a vertical sectional view of the sleeve 26; Fig. 9 is a detail elevation of the spindle 2.

The same numerals refer to the same parts throughout the drawings.

1 is the drill stock or hit holder and 2 the spindle thereof.

3 is the hand operating lever having the arms 4 and 5 bored for the' spindle 2 to pass therethrough. On the outer sides of said arms 4 and 5 are two spring pawls 6 and 7 adapted to engage with right and left hand ratchets 8 and 9 respectively which are formed on the peripheries of two bevel wheels 10 and 11.

12 is a key provided with a finger piece 13 and shoulders 14 and 15.

A key-way 16 is formed in the various parts in order that either of the bevel wheels 10 or 11 may be locked to the spindle 2 by the shoulders 14 0115 respectively taking in the key-way formed in the bevel wheels.

The holding arm or lever 17 is shown clearly in Fig. 4

being bored at its enlarged end for the spindle to pass therethrough and slotted at 18 and 19 to receive the bevel pinions 20 and 21 which are suitably held therein so as to rotate very freely and engage with the bevel wheels 10 and 1.1 in either direction.

22 is a collar held to the spindle 2 by a pin 23.

The thrust of the drill and feed are provided for as follows:-An outer tapped sleeve 24 carries the back point 25. Within said sleeve 24 is another sleeve 26 threaded externally to screw into sleeve 24 and internally to screw on the threaded end of spindle 2. The thread on the end of spindle 2 is of course of opposite pitch to that on the outside of sleeve 26. When the right-hand ratchet 8 is connected to the spindle and engaged and intermittently rotated by the pawl 6, the sleeve 26 forms a part of the sleeve 24, but, when the left-hand ratchet 9 is connected to the spindle and engaged and intermittently rotated by the pawl 7, the sleeve 26 forms a part of the spindle 2. By such an arrangement it is evident that the feed of the spindle will always be in the same direction Whether the spindle is being rotated through the medium of the right or lefthand ratchet, and, furthermore, when a change from the left to the right-hand ratchet is had, it will not be necessary to manually change or adjust the elements of the feed as the change in the elements is automatic.

The operation of the ratchet drill is as follows:-'lhe arm or lever 17 is held by hand or otherwise secured in one position and the hand lever 3 reciprocated as usual. When the key 12 is in the position shown in Fig. 2, that is, the shoulder 14 in engagement with the wheel 10, and the shoulder 15 clear of the wheel 11, the movement of the lever 3 towards the right causes the spring pawl 6 to engage with the ratchet 8, and the wheel 10, spindle 2 and drill stock 1. to rotate. Meanwhile through the pinions 20 and 21, the ratchet 9 and wheel 11 are free to rotate on the spindle 2. On moving the lever 3 to the left the spring pawl '7 engages with the ratchet 9 and the wheel 11. being in gear through the pinions 20 and 21 with the wheel 10 the rotary motion is continued uni formly. To reverse the direction of the motion the 'key 12 is raised by the finger piece so that the shoulder 15 engages with the wheel 11 and the shoulder 14 is clear of the wheel 10, an extension of the key above the finger piece locking the sleeve 26. When it is desired to use an intermittent rotary motion one of the spring pawls 6 or 7 is thrown out of engagement with its ratchet.

Having now described my invention, what I claim as new, and desire to secure by Letters Patent is: w

1. In a ratchet drill, the combination with the spindle carrying the drill stock or hit holder and a key, of two bevel wheels having respectively right and left hand ratchets, either of which bevel wheels may be keyed to the spindle, an operating hand lever with spring pawls mounted on the arms thereof, and a holding arm or lever between said arms and carrying intermediate pinions gearing with the said bevel wheels.

2. A ratchet drill comprising aspindle carrying a drill stock and provided with a scre\vthreaded portion, motion transmitting mechanism for the spindle, means for alternately connecting separate elements of said mechanism to the spindle, causing thereby the alternate rotation of the spindle in opposite directions, and interengaging oppositely-threaded feed sleeves mounted upon and engaging with the screw-threaded portion of the spindle for feeding it when operating in one direction, one of said sleeves adapted to be locked to the stock by said connecting means, causing thereby the feed of the spindle when it is operated in the other direction.

In a ratchet drill, the combination with a spindle earrying a drill stock, of a right and a lefthand ratchet mechanism for rotating the spindle in opposite directions, each of said mechanisms provided with a gear, means extending I through the gears for alternately connecting each of said mechanisms to the spindle, and a holding arm carrying pinions meshing with the gears of said ratchet mechanisms.

-1.- In a ratchet drill, the combination with a tool carrying spindle having a screw-threaded end, of a right and a left-hand ratchet mechanism for rotating the spindle in either direction, each of said mechanisms provided with a l gear, a holding arm carrying intermediate pinions meshing with the gears of said ratchet mechanisms, an inter nally and externally screw-threaded sleeve mounted upon the screw-threaded end of said spindle, the threads upon the periphery of said sleeve extending in a reverse direction with respect to the threads upon the spindle, an internally screw-threaded sleeve engaging the sleeve mounted upon the spindle, and a slidable member adapted to connect and disconnect the gears and arranged to lock the internally and externally-threaded sleeve for the purpose set forth.

In testimony whereof I have hereunto set my hand in presence of two subscribing witneses.

JOHN .IOSEIII HOURIGAN.

Witnesses Cnnnmcs EDWARD GRAHAM, IInNny \VATCI-IORNE CLARKE. 

